US1447855A

US1447855A - Sound clarifier

Info

Publication number: US1447855A
Application number: US367412A
Authority: US
Inventors: Johnson Correl Welton
Original assignee: Individual
Current assignee: Individual
Priority date: 1920-03-20
Filing date: 1920-03-20
Publication date: 1923-03-06
Anticipated expiration: 1940-03-06

Description

Mar. 6, 1923. t

C. W. JOHNSON SOL-IND CLARIFIER Original Filed Mar.

1920 53 disais-sheet l INVENTOR ,4 TTOR/VEYS Mar. 6, 1923. A 1,442,855

C. W. JOHNSON SOUND CLARIFIER Original Filed Mar. 20, 1920 2 sheets-sham /N VEN TOI? TTUH/VEYS Patented Mar. 6, 1923.

UNITED ASTATES 1,441,855 lPATENT oFFlcE.

CORREL WELTON JOHNSON, 0F NEW YORK, N'. Y.

SOUND CLARIFIER.

Application led Karch 20, 1920, Serial N0. 367,412. Renewed July 1, 1922. Serial No. 572,306.

To all whom 'it may concern:

- Be it known that I, CoRREL WELTON JOHN- soN, a citizen of the United States, and a resident of the city of New York, borough of Manhattan, in the county and State of New York, have invented a new and Improved Sound Clarifier, of Which the following is a full, clear, and exact description.

rlhe invention relates to sound clarifiers for sound producing or reproducing instruments such as shown and described in the Letters Patent of the United States, No. 1,217O,0(), granted `to. me on September 11, 191 j The object of the present invention is to provide a new and improved soundclarifier more especially desi rned for use in the amplifying chamber o a phonograph and arranged to eliminate. dead air spaces and to insure a circulation of live air throughout the length of the amplifying chamber to induce clarification of the sounds and to avoid mullling of the same.

Another object is to prevent the formation of counter currents, eddies and other interfering motions within the amplifying chamber, thus insuring the production ofa strengthened, amplified, tensified and clarified tone and eliminating flator inharmonious sounds.

With these and other objects in view, the invention consists of certain novel features of construction as hereinafter shown and described and then specifically pointed out in the claims.

A practical embodiment of the invention is represented in the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a sectional side elevation of the improved sound clarifier as applied to a phonograph of usual construction;

Figure 2 is an enlarged sectional side elevation ofthe improved sound clarifier on the line 2--2 of Figure 3;

Figure 3 is a sectional front View of the same on the line 3-3 of Figure 2;

Figure it is a rear end view of the sound clarifier looking in the direction of the arrows on the line 4 4 of Figure 2;

Figure 5 is an enlarged sectional side elevation of a modified form of the sound clarifier;

Figure G is a sectional front elevation of the same on the line 6 6 of Figure 5; and

Figure -7 is a rear end elevation of the same.

The improved sound clarifier is shown applied to a phonograph of general construction and having a casing 10 provided with a hinged cover 1l and having a top 12 supporting a drive mechanism 13 for rotating the platform 14 carrying the record 15 engaged by the stylus 16 held on the sound box 17 mounted on the tone arm 18 adapted toswing on the top 12. The sound arm 18 is connected with a sound conveyor 2O attached to the under side of the top 12 and this sound conveyor 2O is gradually enlarged toward its outlet 21 which extends horizontally and is connected with the rear end or throat 22 of an amplifyin i chamber, box or horn 23 mounted in t e casing 10 and having its front end 24 opening into the atmosphere surrounding the phonograph.

Into the outlet 21 of the sound conveyor 20 fits a throat member 30 provided with a comparatively large central opening 31- openL lng into the throat 22 of' the `amplifying' vchamber 23. The throat member 30 is provided adjacent the corners with small openings 32 leach having a flaring mouth 33 opening into the discharge end 21 of the sound conveyor 20. The rear edges of each mouth 33 are knife-like and hence form no obstruction to the passage of a portion of the sound waves coming through the sound conveyor 20, it being understood that the major portion of the said sound waves passes through the central opening 31 and the remaining portions of the sound waves pass through the apertures 32.

Within the amplifying chamber 23 is arranged a hollow deflectmg means, preferably in the form of one, two or more hollow deflectors 40: for instance, two such flectors as shown in Figures 1, 2 and 3, or a sirlxgle one as illustrated in Figures 5, 6 and 7. ach of the deflectors 40 has a pointed inner end 41 in register with the central opening 31 of the throat member 30, and each deflector 40 has one or, more tubular connections with the corresponding aperture 32. Each tubular connection comprises a short tube 50 screwed or otherwise secured into the wall of the corresponding aperture 32 and this tube 50 projects horizontally from the front of the throat 30 and telescopes with the rear end of a tube 51 order to direct the sound waves coming through the tubular connections from the apertures 32 in a forward direction within the corresponding defiectors 40 the rear ends thereof are provided with plugs 42 provided with inclined faces to direct the sound waves forwardly within the hollow deflectors 40. It will be noticed that by the arrangement described the tubular connections connecting the throat 30 with the deflecting means form a support for tle deflecting means to hold the latter within the amplifying chamber 23 and with the walls of the deflecting means practically parallel with the walls of the amplifying chamber 23 to provide a symmetrical, uniform passageway between the walls of the deflecting means and the walls of the amplifying chamber. In case two or more defiectors 40 are used then the same are connected with each other near their rear ends by a suitable bridge or bracket 43,' as plainly shown in Figures l, 2 and 3.

It is understood that the amplifying chamber 23 gradually increases from the throat to the mouth, and the deflectors 40 are correspondingly constructed, but their open forward ends preferably terminate a distancefrom the mouth 24 of the amplifying chamber 23. By the arrangement described dead air spaces in the amplifying chamber and the deflectors 40 are eliminated and hence the .sound waves are not liableto be mufHed as a free circulation'of live air is tones which coalesce with the clarified sound waves passing through the amplifier 23. It will be noticed that the enclosed air molecules are divided and serve to prevent interference of counter currents or eddies. due to vibration of the sound waves resulting from oscillation ofthe air molecules transmitting sound, whereby the sound is strengthened, amplified and tensified and the tone clarified so that all flatness of sounds out ofharmony with the sounds sought to be reproduced are eliminated.

It is understood that a hollow deflector of shell formation is utilized as an auxiliary resonator of smaller compass than the amplifying chamber to preserve the delicate harmonics heretofore lost with the reverberations at the restricted end of the amplifying chamber, and as the smaller deflector 4:0 gives greater response to tones of high register and is used in combination with a resonator of larger compass which has a greater response to tones of lower and middle register it insures a further clarification of the sounds emitted at the mouth v241 and adds to thetone quality.

Having thus described my invention, I claim as new and desire to secure by Letters Patent pointed inner end and having an open outer end, the said deflector coacting with the walls of the amplifier for deflecting the mavjor portion of the sound waves delivered by the said sound conveyor against the walls of the amplifying chamber, and a connection connecting the said Sound conveyor with the interior of the said deflector adjacent the closed pointed end to conduct the remaining portion of the sound waves coming from the sound conveyor through the said deflector.

2. A sound clarifier for a sound producing instrument having an amplifying chamber and a sound conveyor connected thereto, said clarier comprising a hollow resonating defiector positioned within the amplifying chamber and having a closed pointed inner end and having an open outer end, the said deiector coacting with the walls of the amplifier for deiiecting the major portion of the sound waves delivered by the said sound conveyor against the walls of the amplifying chamber, a throat member fitted into the outlet of the sound conveyor and having a central opening in register with the said pointed inner end of the resonating deflector, the said throat member having an auxiliary opening, and a connecting tube connecting the said auxiliary opening with the interior of the said deflcctor adjacent the closed pointed inner end.

3. A sound clarifier for a sound producing instrument having an amplifying chamber and a sound conveyor connected thereto7 said clarifier comprising a hollow resonatingdefiector positioned within the amplifying chamber and having a closed pointed inner end and having an open outer end, the said deflector coacting with the walls of the amplifier for deflecting the major portion of the sound waves delivered by thevsaid sound conveyor against the walls of the amplifying chamber, a throat member fitted into the outlet of the sound conveyor and having a central opening in register with the said pointed inner end of the resonating deector, the said throat member having an auxiliary opening and a connecting tube connecting the said auxiliary opening` With the interior of the. said deflector adjacent the closed pointed inner end, the said connecting tube forming a support for the detlector and being made in telescoping sections.

4. A. sound clarifier for a sound producing instrument having` an amplifying chamber and a sound conveyor connected thereto, said clarifier comprising a hollow resonating deflector positioned Within the amplifylng chamber and having a closed pointed inner end and having an open outer end, the said deflector coacting with the Walls of the amplifier for deflecting the major portion of the sound waves delivered by the said sound conveyor against the Walls of' the amplifying chamber, a throat memn ber fitted into the outlet of the sound conveyor and having a central opening in register with the said pointed inner end ot the resonating deflector, the said throat member having at least one comparatively small opening provided with a flaring mouth opcning into the sound conveyor, and a. tube engaging the said small opening and leading into the said resonating deflector adjacent the pointed end thereof.

A sound clarifier :tor a. sound producing instrument having an amplifying chamber and a sound conve-yor Jconnected thereto, said clarifier comprising a. hollow resonating deflector positioned within the amplifying chamber and having a closed pointed inner end and having an open outer end. the said deflector coacting with the `walls ot the amplifier for defleeting the major portion of the sound Waves delivered by the 'said sound conveyor against the walls of the am plifying chamber, a throat member fitted into the outlet ot the sound conveyor and having a central opening in register with the said pointed inner end ot the resonating de flector, the said throat member having at least one comparatively small opening provided with a flaring mouth opening into the sound conveyor, and a tube engaging the said small opening and leading into the said resona-ting deflector adjacent the pointed end thereof` the said tube forming a support ior the defiector to hold the saine in spaced relation to the ivalls of the amplifying chamber.

(i. The combination with an ai'nplitying chamber ot rectangular cross section and tapered toward its inlet end` ol a sound cone veyor and a clarifier embodying a substan tially pyramidal shell supportei' chamber to deflect the sound Wav" forml}v therearouinl. said shell beine closed at its apexV and be tapered end terminating a of the sound conveyor@` shell terminating withii distance Ytrom the mouth q 515 T. The combination horn of a reproducing instrument t g in one. direction and a sound convcyn iet-ted thereto.

of a deflector positioned in horn and ha v# ing an inlet tapered navins: 'the 'Je ainplix'ying if* instrument 'l thc-,rs- E and av sound conveyor i' an improved sound clarin shell defiector positioned i and. supported indi-pe t0 receive sound imite at spaced points ali mentions.

lll. A shell de lector i box or tone chamber. havin lar supports 'for the p said shell doflector in proper A ll.. A system oi inipifffwl ot multiple resonai' k said deflect having its Walls adjacent its a said apex conve x' its opposite wall Vl ing the .sound fires into one unit The conrliiininfproducii .ien taperiir tion and a sound ronvorvi of a deflerlor ot .bcli closed iincr end a Af" l.

r insti;

Sound waves into ijle